Any fuel additives that work

My question is--- What Product that comes in a 16 oz
container & then diluted in 16 to 18 gallons of fuel,
would do much of anything?

So my answer is,there is nothing wrong with those
products & they won't hurt anything,but they won't do
anything either

So the answer is-- to properly diagnose the vehicles problems & try & return it, as close to new as built condition, as possible

You may have a Flat Spot in the TPS Sensor (throttle position sensor)
located on the throttle body. But that has to be tested

Also replacing the Oxygen Sensors closest to the engine,
every 80 to 100,000 miles, will give you better throttle response